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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 149 (Airbag System (HEV) - Diagnostic Codes (2 Of 2) & Symptom Tests) >> AIRBAG SYSTEM (for HV Model) >> SRS Warning Light Remains ON [01/2019 - 09/2022] >> Procedure

SRS Warning Light Remains ON [01/2019 - 09/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK SRS WARNING LIGHT OPERATION 
    1. Turn the power switch on (IG) and check the SRS warning light condition.

      HINT: 

      The primary check is performed for approximately 6 seconds after the power switch is turned on (IG).

      Result

      Result Proceed to
      After the primary check period, the SRS warning light remains on. A
      After the primary check period, the SRS warning light turns off and comes on again. B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK AUXILIARY BATTERY VOLTAGE 
    1. Measure the voltage of the auxiliary battery with the power switch off.

      Standard Voltage

      11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSPECT CHARGING SYSTEM AND AUXILIARY BATTERY. Refer to  ON-VEHICLE INSPECTION [01/2019 - 09/2022] 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTOR 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connector is properly connected to the airbag sensor assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the airbag sensor assembly.
    5. Check that the terminals of the connector are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE WIRE HARNESS 

    Result: 

    OK 

    See step  4

  4. CHECK WIRE HARNESS (AIRBAG SENSOR ASSEMBLY - BODY GROUND) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      GTY911105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Turn the power switch on (IG).
    3. Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I47-36 (IG2) - Body ground Power switch on (IG) 8 to 16 V
    5. Turn the power switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I47-33 (E1) - Body ground Always Below 1 Ω
      I47-32 (E2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE WIRE HARNESS 

    Result: 

    OK 

    See step  5

  5. CHECK SRS WARNING LIGHT 
    1. Turn the power switch on (IG) and check the SRS warning light condition.

      OK

      After the primary check period, the SRS warning light turns off for approximately 10 seconds and then turns back on.

      HINT: 

      The primary check period is approximately 6 seconds after the power switch is turned on (IG).

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

  6. CHECK CAN COMMUNICATION SYSTEM 
    1. Using the Techstream, check if the CAN communication system is functioning normally.

      OK

      CAN communication system is functioning normally.

      HINT: 

      Refer to Communication Bus Check in CAN Communication System.

      Refer to DIAGNOSIS SYSTEM [01/2019 - 04/2020] , or refer to DIAGNOSIS SYSTEM [04/2020 - 09/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [01/2019 - 09/2022] 

    Result: 

    OK 

    See step  7

  7. CHECK AUXILIARY BATTERY VOLTAGE 
    1. Measure the voltage of the auxiliary battery with the power switch off.

      Standard Voltage

      11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSPECT CHARGING SYSTEM AND AUXILIARY BATTERY. Refer to  ON-VEHICLE INSPECTION [01/2019 - 09/2022] 

    Result: 

    OK 

    See step  8

  8. CHECK CONNECTOR 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connector is properly connected to the airbag sensor assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the airbag sensor assembly.
    5. Check that the terminals of the connector are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE WIRE HARNESS 

    Result: 

    OK 

    See step  9

  9. CHECK WIRE HARNESS (AIRBAG SENSOR ASSEMBLY - BODY GROUND) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      GTY911105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Turn the power switch on (IG).
    3. Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I47-36 (IG2) - Body ground Power switch on (IG) 8 to 16 V
    5. Turn the power switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I47-33 (E1) - Body ground Always Below 1 Ω
      I47-32 (E2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE WIRE HARNESS 

    Result: 

    OK 

    See step  10

  10. CHECK CONNECTOR 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    2. Check that the connector is properly connected to the combination meter assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

    3. Disconnect the connector from the combination meter assembly.
    4. Check that the terminals of the connector are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      GTY895889Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I4-38 (IG+) - Body ground Power switch on (IG) 11 to 14 V
      I4-22 (B) - Body ground Power switch off 11 to 14 V
    4. Turn the power switch off.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I4-23 (ES) - Body ground Always Below 1 Ω
      I4-19 (EP) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE WIRE HARNESS 

    Result: 

    OK 

    See step  12

  12. CHECK SRS WARNING LIGHT 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    2. Connect the connector to the combination meter assembly.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG) and check the SRS warning light condition.

      OK

      After the primary check period, the SRS warning light turns off for approximately 10 seconds and then turns back on.

      HINT: 

      The primary check period is approximately 6 seconds after the power switch is turned on (IG).

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

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